· Cool lamps range from: 3,600k to 6,500k

· Neutral lamps range from: 3,000k to 3,600k

· Warm lamps range from: 2,700k to 3,000k

· Fluorescent lamps are available in Cool, Neutral, & Warm.

· Halogen lamps are considered Neutral.

· Incandescent lamps are considered Warm.


Cool for Vegging... usually around 5,500k .... Warm (or Red) for Flowering.

Neutral is what we don't want.. hence making Halogen's useless